Make sha1_array_append take a struct object_id *

Convert the callers to pass struct object_id by changing the function
declaration and definition and applying the following semantic patch:

@@
expression E1, E2;
@@
- sha1_array_append(E1, E2.hash)
+ sha1_array_append(E1, &E2)

@@
expression E1, E2;
@@
- sha1_array_append(E1, E2->hash)
+ sha1_array_append(E1, E2)

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

combine-diff.c

@@ -1535,7 +1535,7 @@ void diff_tree_combined_merge(const struct commit *commit, int dense,
 	struct sha1_array parents = SHA1_ARRAY_INIT;
 
 	while (parent) {
-		sha1_array_append(&parents, parent->item->object.oid.hash);
+		sha1_array_append(&parents, &parent->item->object.oid);
 		parent = parent->next;
 	}
 	diff_tree_combined(commit->object.oid.hash, &parents, dense, rev);